US4671645A - Driving mechanism for turning a photosensitive drum in an electrophotographic copying machine - Google Patents

Driving mechanism for turning a photosensitive drum in an electrophotographic copying machine Download PDF

Info

Publication number
US4671645A
US4671645A US06/854,921 US85492186A US4671645A US 4671645 A US4671645 A US 4671645A US 85492186 A US85492186 A US 85492186A US 4671645 A US4671645 A US 4671645A
Authority
US
United States
Prior art keywords
drum
turning
brake
photosensitive drum
driving mechanism
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/854,921
Other languages
English (en)
Inventor
Masashi Saito
Tsutau Shimamura
Kojiro Henmi
Hiroki Kyushima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DAINPPON SCREEN Manufacturing Co Ltd
Dainippon Screen Manufacturing Co Ltd
Original Assignee
Dainippon Screen Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Assigned to DAINPPON SCREEN MFG. CO., LTD. reassignment DAINPPON SCREEN MFG. CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SHIMAMURA, TSUTAU, HENMI, KOJIRO, KYUSHIMA, HIROKI, SAITO, MASASHI
Application filed by Dainippon Screen Manufacturing Co Ltd filed Critical Dainippon Screen Manufacturing Co Ltd
Application granted granted Critical
Publication of US4671645A publication Critical patent/US4671645A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/75—Details relating to xerographic drum, band or plate, e.g. replacing, testing
    • G03G15/757—Drive mechanisms for photosensitive medium, e.g. gears

Definitions

  • the present invention relates to a driving mechanism for turning a photosensitive drum in an electrophotographic copying machine, which includes a brake loading means for braking the drum against a driving force for turning it.
  • the electrophotographic copying machine produces an equivalent electrostatic latent image for an original image on a photosensitive material of the peripheral surface of the photosensitive drum by scanning the original image under exposure and then records a reproduced image on recording paper by making the latent image to be visible by a toner development and transfering the toner developed image to the paper.
  • the driving mechanism for both scanning system and photosensitive drum system have power transmitting means generally composed of pulleys, belts, gears, etc. and also the forces of inertia of said both systems are different to each other, the synchronization therebetween becomes worse due to backlashes in the driving mechanisms.
  • Japanese Utility Model Publication No. 31548 of 1980 discloses the driving mechanism of above mentioned type which is provided with a brake loading means for braking the turning of a photosensitive drum constantly by a predetermined frictional braking force. That is, by mounting the flange of the photosensitive drum rotationally to a fixed axis, fixing a spring retainer to the axis, then fitting a ring-shaped braking spring, which is axially deformable, loosely to the axis between the flange and the spring retainer and forcing this braking spring contact to the flange of the drum constantly under a predetermined pressure, it is intended for the brake loading means to apply the predetermined frictional braking force upon the turning of the drum and to synchronize the peripheral speed of the photosensitive drum (the moving speed of the drum surface) and the scanning speed under expouser.
  • the brake loading means in the above described prior art is composed of the brake loading device only for the photosensitive drum, there exists a limitation for improving the synchronization.
  • the adverse effect by the backlashes in the driving mechanism which connects the electric motor 3 to the photosensitive drum 2 is not eliminated by the above described brake loading means only for the drum, some distortions are generated in the part of the reproduced image correponding to the time when either the feeding or the removal of the recording paper is commenced, and consequently the production of the latent image and the transference of the former image onto the paper can not be done in parallel.
  • the flucture in the above mentioned speed of the drum in the prior art is around 0.2-0.3 % of its standard speed at that time. But it is necessary to keep the flucture within the extent of 0.1% in order to attain a reproduced image of high grade quality. The bad influences by the former flucture value can not be eliminated in the prior driving mechanism.
  • the braking force by the brake loading means can be increased as the countermeasure to eliminate the above described defects, it adds substantially to the cost because of increasing the out put power of the turning motor according thereto, hence, it is not advantageous. Further, even though it can be thought out that the electrostatic latent image is to be produced at the first turn of the photosensitive drum thereon and then the toner development and the transference of the toner developed image are to be done at the second turn of the drum, it has such defects as the time required for one cycle becomes two times and an image longer than one circuit of the peripheral length of the drum becomes impossible to be reproduced.
  • the present invention is directed to solving the problems noted above, and has for its object to provide a driving mechanism for turning a photosensitive drum in an electrophotographic copying machine, which can synchronize the peripheral speed of a photosensitive drum and the scanning speed under expouser more strictly.
  • the means of the present invention for accomplishing the above purpose is a driving mechanism for turning a photosensitive drum in an electrophotographic copying machine, in which a brake loading means comprises a brake loading device for the drum, which applies a predetermined frictional braking force upon the turning of the drum, and a brake loading device for a power transmitting means, which applies a predetermined braking force upon the turning of at least one rotary follower axis in the power transmitting means.
  • FIG. 1 is a schematic representation of the principal part of a preferred embodiment of a driving mechanism for turning a photosensitive drum in an electrophotographic copying machine according to the present invention
  • FIG. 2 is a sectional side elevation of a brake loading device for a photosensitive drum of the embodiment in FIG. 1;
  • FIG. 3 is a perspective view of an electrophotographic copying machine according to the present invention.
  • FIG. 4 is a sectional side view on line IV--IV in FIG. 3.
  • a relatively large-sized electrophotographic copying machine comprises an operation panel 50 at the center of its front side, an original feeding and scanning equipment 100 at its left side and a reproduced image recording equipment 200 at its right side.
  • the original feeding and scanning equipment when an original, of which image facing onto an original setter 101, is fed into the equipment, it is returned to an original receptacle 102 through its predetermined pathway being illuminated therein. While the original being fed through the pathway, the image of the original is exposed on a photosensitive drum 2 through an optical system 20 so that it may produce the corresponding electrostatic latent image thereon, which is made to be visible by means of the toner development device 21 in the recording equipment 200. Then the visible toner developed image is transferred on a sheet of recording paper 22, which is thereafter fed out to a copy receptacle 202 through its predetermined pathway 25 for the sheet.
  • the numeral 1 is the framework of the electrophotographic copying machine; 2 is the photosensitive drum; 3 is an electric motor, 4 is a power transmitting means which connects the electric motor 3 to the photosensitive drum 2 drivingly; 12 is a brake loading device for the power transmitting means; and 14 is a brake loading device for the drum.
  • the pulley 6 fixed onto the axis 5 is connected drivingly with the pulley 8 fixed onto the out put shaft of the electric motor 3 through the timing belt 7, and also the drive gear 9 fixed onto the rotary follower axis 5 is in mesh with the the follower gear 11 fixed onto the support shaft 10 of the photosensitive drum 2 so as for the turning force of the electric motor 3 to be transmitted to the photosensitive drum 2.
  • the powder brake 12 applies a braking force onto the follower axis 5, which is controlled to a required intensity by regulating the electric current intensity to the brake 12.
  • the brake loading device 14 for the drum is arranged so as to contact slidingly with the annular abrassion resistance rings 13 fixed on the outer peripheral surfaces at the both edges of the photosensitive drum 2 and comprises a brake shoe 15 to contact with the rings 13, a fixing plate 16 of the brake shoe and a pushing leaf spring 18 combined therewith by a screw 17 to push the brake shoe 15 to the ring 13, as shown in FIG. 2.
  • the pushing leaf spring 18 is fixed at its one part, while the other part being free, on the framework 1 according to the turning direction (shown by arrow A) of the drum so as to apply a predetermined frictional braking force to the photosensitive drum through the shoe 15.
  • the driving mechanism of the present invention is applicable not only to the photosensitive drum of PPC (Plain Paper Copier) type with a photosensitive layer formed on the drum surface but to the photosensitive drum of CPC (Coated Paper Copier) type for the drum to be wound by such a recording paper as coated with sensitive material thereon in a electrophotographic copying machine, with equal effects.
  • PPC Pulin Paper Copier
  • CPC Coated Paper Copier
  • the present invention can be applied more advantageously to a large-sized electrophotographic copying machine.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
US06/854,921 1985-04-27 1986-04-23 Driving mechanism for turning a photosensitive drum in an electrophotographic copying machine Expired - Fee Related US4671645A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP60-63778[U] 1985-04-27
JP1985063778U JPS61179560U (US07922777-20110412-C00004.png) 1985-04-27 1985-04-27

Publications (1)

Publication Number Publication Date
US4671645A true US4671645A (en) 1987-06-09

Family

ID=13239171

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/854,921 Expired - Fee Related US4671645A (en) 1985-04-27 1986-04-23 Driving mechanism for turning a photosensitive drum in an electrophotographic copying machine

Country Status (2)

Country Link
US (1) US4671645A (US07922777-20110412-C00004.png)
JP (1) JPS61179560U (US07922777-20110412-C00004.png)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5136330A (en) * 1990-10-15 1992-08-04 Asahi Kogaku Kogyo Kabushiki Kaisha Irregular rotation prevention structure for photoconductive drum
US5194896A (en) * 1992-01-29 1993-03-16 Eastman Kodak Company Magnetic brake for pivotal device
EP0586868A2 (en) * 1992-09-11 1994-03-16 Konica Corporation Driving device of rotational body for use in image forming apparatus
US5303004A (en) * 1988-02-19 1994-04-12 Canon Kabushiki Kaisha Apparatus for driving image bearing member via torque limiter
EP0675413A2 (en) * 1994-03-29 1995-10-04 Kabushiki Kaisha TEC Image forming apparatus
US5678144A (en) * 1994-10-11 1997-10-14 Konica Corporation Image forming apparatus having a rotational information detector for a photoreceptor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5605700B2 (ja) * 2010-11-08 2014-10-15 富士ゼロックス株式会社 画像形成装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1153636A (en) * 1911-01-21 1915-09-14 Thomas J Longden Brake mechanism for loom let-offs.
US1236392A (en) * 1914-05-28 1917-08-14 Ezra Barger Brake.
US4148578A (en) * 1978-04-28 1979-04-10 Pitney-Bowes Inc. Reciprocating carriage drive system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1153636A (en) * 1911-01-21 1915-09-14 Thomas J Longden Brake mechanism for loom let-offs.
US1236392A (en) * 1914-05-28 1917-08-14 Ezra Barger Brake.
US4148578A (en) * 1978-04-28 1979-04-10 Pitney-Bowes Inc. Reciprocating carriage drive system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5303004A (en) * 1988-02-19 1994-04-12 Canon Kabushiki Kaisha Apparatus for driving image bearing member via torque limiter
US5136330A (en) * 1990-10-15 1992-08-04 Asahi Kogaku Kogyo Kabushiki Kaisha Irregular rotation prevention structure for photoconductive drum
US5194896A (en) * 1992-01-29 1993-03-16 Eastman Kodak Company Magnetic brake for pivotal device
EP0586868A2 (en) * 1992-09-11 1994-03-16 Konica Corporation Driving device of rotational body for use in image forming apparatus
US5323211A (en) * 1992-09-11 1994-06-21 Konica Corporation Driving device of rotational body for use in image forming apparatus
EP0586868A3 (en) * 1992-09-11 1994-08-17 Konishiroku Photo Ind Driving device of rotational body for use in image forming apparatus
EP0675413A2 (en) * 1994-03-29 1995-10-04 Kabushiki Kaisha TEC Image forming apparatus
EP0675413A3 (en) * 1994-03-29 1996-01-17 Tokyo Electric Co Ltd Apparatus for image making.
US5512976A (en) * 1994-03-29 1996-04-30 Kabushiki Kaisha Tec Image forming apparatus having rotation resistance adjusting means for adjusting rotation resistance on a photosensitive drum
US5678144A (en) * 1994-10-11 1997-10-14 Konica Corporation Image forming apparatus having a rotational information detector for a photoreceptor

Also Published As

Publication number Publication date
JPS61179560U (US07922777-20110412-C00004.png) 1986-11-08

Similar Documents

Publication Publication Date Title
JP3497237B2 (ja) ゼログラフィックプリンタ
JPS6051866A (ja) 画像形成装置
JPS6261820B2 (US07922777-20110412-C00004.png)
CA1049771A (en) Articulated development apparatus
US4671645A (en) Driving mechanism for turning a photosensitive drum in an electrophotographic copying machine
KR0154707B1 (ko) 화상 형성 장치의 프로세서 카트리지
US4330194A (en) Method of driving copy material and photosensitive member of copying apparatus
US5006903A (en) Sheet separating device and apparatus for use therein
JPS61100770A (ja) カラ−複写装置
US4951095A (en) Copying apparatus with image smear control
EP0117533B1 (en) Automatic developing bias control device
US4353540A (en) Sheet feeder with pivotable baffle
US4538903A (en) Multiple magnification mode copying apparatus
US5194896A (en) Magnetic brake for pivotal device
JP3320786B2 (ja) 印刷装置の用紙搬送装置及び方法
KR940005127B1 (ko) 전자사진 방식을 이용한 기기의 구동부 구동장치
EP0350310A3 (en) Image recording apparatus
JPH0365975A (ja) 電子写真記録装置
JPS61129665A (ja) 現像装置
CA1037545A (en) Color corrected printing system
JPS6283968A (ja) ロ−ル給紙装置
JPH02183276A (ja) フルカラー複写装置
GB1561885A (en) Electrostatopraphic apparatus
JPH0774929B2 (ja) 電子写真複写装置
JP3013409B2 (ja) 画像形成装置

Legal Events

Date Code Title Description
AS Assignment

Owner name: DAINPPON SCREEN MFG. CO., LTD., 1-1, TENJINKITAMAC

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:SAITO, MASASHI;SHIMAMURA, TSUTAU;HENMI, KOJIRO;AND OTHERS;REEL/FRAME:004569/0632;SIGNING DATES FROM 19860318 TO 19860417

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 19910609